There are a couple of potential issues with your usage:

1. The ability to achieve good results on IQ tests is correlated with various figures of interest. See the references that Carl Shulman gives here. As such, IQ does have a functional and useful technical meaning and assigning it a new meaning can be confusing.

2. Different people may have different notions of "the underlying trait that IQ tests are supposed to be measuring." In particular, there's a serious possibility of perhaps unknowingly taking one's own mental architecture (including aesthetic preferences) to define the direction (if not magnitude) in mind-space of this trait on account of generalizing from one example.

The use of "intelligence" stands to suffer from (2) though not (1). I've found it most fruitful to maintain a positivistic attitude toward intelligence as a concept unless I'm in conversation with somebody who I know attaches the same connotations to the term that I do.